There are right now probably three different methods that are being used to contemplate bringing back species. The most traditional is what they refer to as back breeding, and we see that going on right now with the ancient cattle called aurochs. Basically, what they do is they start by taking the strains of cattle that are closest to the ancient aurochs and try to breed back in much the way they do with plant biology and hybridization.
The other area that is being done is in cloning, and the best example of that is with the Spanish Pyrenean ibex (a wild mountain goat). They actually were able to get some cellular matter from the last remaining ibex to clone. The Spanish scientists that did all that work feel that that cloning is completely viable. The truth is that when they did that ibex, it only lasted seven minutes, because of a particular lung frailty. That's quite common in cloning anything. That is just something that cloning technology has to deal with, so he feels really confident if he had funding he could clone an extinct species now without a problem, and solve the lung issue.
The third concept is the one that we're focused on right now: genome editing that George Church is pioneering. The way it would work (and again, I'm not the scientist here, George is better to explain it) the idea would be to take the most closely related extant living species and actually compare it genomically with the extinct species, and basically gene by gene match it, and edit it accordingly.
The species of choice right now that we're looking at helping, aiding, and abetting, is the passenger pigeon, and the passenger pigeon, as you may know, is an iconic bird that had flocks in the billions just over a hundred years ago. A hundred and fifty years ago the passenger pigeon darkened the sky when it would pass. They say that these flocks were so thick in the sky that when they passed it could take a mile for a flock of birds to go by. They would darken the sky. It's an amazing concept. We don't have anything like that today. When that happened, it went from being the most prolific bird, and in just 30 years to being extinct. Why does that matter? Well, it matters for a lot of reasons. What was going on ecologically there? What did that bird bring to that whole eastern deciduous forest? God knows, it had a tremendous impact. I think we're just now trying to figure out what would that impact might be like today if you were to reintroduce it.
The idea with the passenger pigeon is to take a closely related relative, which is the and-tailed pigeon, and sequence that genome. We're sequencing that right now at Harvard, with an intern that we're helping to fund, named Ben Novak. Right now we're in the process of doing that work, and then they will basically edit the band-tail genome until the band-tail walks, and talks, and flies like a passenger pigeon. That's how resurgence will occur.
We're using the term "resurgence" because as you can imagine, there's a lot of controversy over if you could bring back an extinct species, is it invasive? Would it become an invasive species? And is this a bad thing?
We're in the process of starting a new organization. It's called Revive and Restore. If we were to say it has a mission, it's to help rethink extinction, to basically bring back extinct species if it's the right thing to do. We're contemplating the ethics involved in all this. This fall we'll have a conference that we're sponsoring in Washington DC, and I think it's going to be thrilling. We're bringing in 25 to 35 the scientists from all over the world that are actually doing extinction work— from the Korean team that's working on the wooly mammoth, to the New Zealand and Australian teams that are de-extincting some species yet to be identified. They're calling it the Lazarus Project. We don't really know what it is. It could be the Moa. There are different theories about what it is. But, hopefully, in the fall we'll learn more about that.
We'll be talking with these scientists about the different technologies that they're deploying, of which this genome hybridization technique that George is doing is going to be one and I'm sure there are others. We'll be talking about the ethics of re-wilding. It's one thing to actually bring back a species in the lab. It's another to actually release it into the wild. And so we'll be talking to scientists that are working in captive breeding, like the San Diego Zoo, with the California ondor. We'll be talking with the frozen zoos that are doing this kind of banking of genetic material, and trying to figure out what kind of ethical framework we could create, so that when these scientists actually start to succeed in these fields we can somehow socialize this in the public discourse.
What I fear, quite honestly, is backlash that we've seen around genetically modified foods, that these organisms will be deemed genetically modified, which, of course, they are. This is genome engineering, and there may be way too much of a concern over what happens when they go into the wild.
One of the fundamental questions here is, is extinction a good thing? Is it "nature's way"? And if it's nature's way, who in the world says anyone should go about changing nature's way? If something was meant to go extinct, then who are we to screw around with it and bring it back? I don't think it's really nature's way. I think that the extinction that we've seen since man is 99.9 percent caused by man.
I'm going to just take the passenger pigeon as an example, not because it's my favorite bird, but because it's so iconic. If we are the ones that are responsible for blasting it out of the sky, do we have a little bit of responsibility to think about bringing it back now that we have science that can easily allow for it? I say "easily," but in the scheme of things, it's still going to be a lot of heavy lifting to help make this happen.
What does all this mean to the average citizen? A good example of a reintroduction of a species is the peregrine falcon. The peregrine falcon had actually gone extinct as a species in the East. For many of us bird lovers, we love the peregrine falcon. We love seeing that bird fly and soar like it does. But, it was really only through captive breeding and a reintroduction of a sub-species from the Rocky Mountain area that we even have a peregrine now flourishing on the East Coast. Where the peregrine falcon really wants to nest is on bridges or on the sides of skyscrapers, and that bird is now evolving into a bird that is better adapted for working in an urban environment.
What's going to happen is, even if we were to have a passenger pigeon, they're not going to be in the flocks of the billions any more. Their impact with agriculture will be lessened, because of an obvious reduction in size. The truth is, if anything happened with that bird, we know it's a tremendous game bird that people loved, and probably people would be shooting it for good meat, good game.
One question is: If you could actually bring back anything, would you bring back the California grizzly bear? A species that could eat people? Well, we recently were at the California Academy of Sciences, up front and personal with “Monarch”, the last California grizzly, a beautiful specimen there, and we were joking, and not really joking, saying, "Well, what if you could genome edit the California grizzly so that it didn't like the taste of people?" That would be kind of interesting! Big megafauna, good for the land, but take the fear of it out for people. The truth is all of this could someday be possible.
Some people have said to us, "Well, are you one click away from "Jurassic Park" here?" The truth is, we're not. "Jurassic Park" was a good movie, if that, but the science is not there at all today, and the reason for that is that we don't have a close relative of the dinosaurs. We just don't have it. The only reason that this concept of bringing back an extinct species works right now is if you can take those genomes and actually edit them based on either a close living relative, or you've got viable cell tissue, and we don't have that. So right now that one is not a worry. But could it be someday? Sure.
The concept of Revive and Restore is an idea that might well blossom on the West Coast, here in Silicon Valley, but the truth is that the pressures that I think all these scientists who are working in de-extinction worldwide will feel will be around this whole question of: Who are you to play God and bring back an extinct species? Who are you to introduce something that could be "invasive"? Whether it's in academia or it's being done in industry, I think the science is going to be challenged around this really intriguing issue. That's why I think an organization like Revive and Restore can actually help with the public discourse.
Somebody has to responsibly help the industry and academia think through these heady issues, and I think we're going to start that dialogue this fall. But in the absence of it, what we're going to see is the, "Oh, my God, we're cloning this dangerous species again," or we're doing something horrific with our chicken to avoid the Avian flu. These things are going to happen.
Everyone wants to bring up the Neanderthals, and interestingly enough, anyone who's working around the Neanderthal genome is reluctant to participate in our fall workshop, because they last thing they want is to be criticized or implicated in bringing back a Neanderthal. It's just verboten.
I've been dealing with this whole genetic exceptionalism now for almost a decade with personalized medicine. There has always been a hypersensitivity to anything genetic and I'm looking forward to when we get over that.
The most interesting part of all this is going to be where the science goes, what we learn from doing this. It's not going to be necessarily about bringing back something. It's going to be about what we learn.
Just like everything that we know that's really innovative in science, you never know the unintended benefits or what the outcomes are going to be. Specifically, around the study of extinct species we're going to probably learn what made them vulnerable to extinction. The implications for endangered species are tremendous. We don't really know why things go extinct. We can surmise, but right now we could actually start to look at the genetic level, at what some of these contributory factors were, and I think that's really exciting.